along the same lines as the previous carb question... i have a 600cfm edelbrock from a 400 i had. is that too small for a stock 460? will it not get enough air for decent performance? would i be better off to find a stock one for now?

thanks guys

TrackStar

 

When I needed to replace the factory Holley on mine I called the Summit tech line. They told me the original carb was more than likely a 600 cfm and recommended that size. I've been happy with it. It seems to run quite well. Good luck.

Rodger

 

I think i'll give it a try.
thanks for the info Rodger

TrackStar

 

Keep in mind I have never played with a Ford big block with a carb, all my carb experience is with a B Wedge.

A 600cfm is a good compromise carb for all around street driving and good gas mileage. I forget the exact formula now but it is in a Holly "how to hot rod your car" type book. For an engine around 400ci, a carb around 700-800cfm would be about maximum for a very healthy street performer. Unless your truck has cam, headers, high compression and turning 8,000RPM etc, you probably will be just fine with a 600cfm and will get better gas mileage too.

A lot of the CFM requirement has to do with how many RPMs your engine is likely to turn. If your engine has a redline above the usual 4,500 to 5,000RPM, then maybe you could use a bigger carb. An engine is really just an airpump, so the faster you turn the more air it will pump.

Good Luck,

Jim Henderson

 

RPM X CUBES DIVID X 3.145 WILLGIVE YOU THE CARB SIZE APX

 

 

[updated:LAST EDITED ON 30-Jan-02 AT 10:44 PM (EST)]Cubic Inches X Max RPM then divide by 3456 = cfm required.
460 X 5000 / 3456 = 665.5 cfm. A 600 works fine!! Mine did. This is the way according to Holley themselves!